The health tracker that runs on light.
Ray is a solar-powered fitness band that charges when you go outside. Improve your sleep, log your steps and activity, and track your heart health — lots of features in a tiny package.
At seven grams and no subscription, the Ray is what other trackers wish they could be: your effortless health companion.
One minute of sun. One day of power.
1,440 minutes in your day.Ray needs one.
Outdoor sunlight only. The one-minute figure refers to direct sunlight outdoors.
One minute of sun. One day of power.
The Ray is missing a charging port, because there's nothing to plug in! A tiny solar cell under the glass keeps it running from the light you already live in. It charges the same way you tan: by going outside.
Go two months without seeing the sun, and it'll still be running when you come back.
Wake up to a morning brief, every morning
The Ray's research-grade sensors are running around the clock to measure the biosignals that a sleep lab looks for and prepares you for the day ahead. No tapping, no syncing, no thinking.
Customize your Ray
Any color you like, as long as it's gold or silver.
Ray
Powered by light.
Gold or silver, three bands. Choose the finish and price that feel right.
Ray
Powered by light.
Gold or silver, three bands. Choose the finish and price that feel right.
The health tracking wristband with everything you need
Lengths represent the band + Ray, so match it with your wrist circumference. Between sizes? We recommend Small / Medium.
Early supporter price
$219
- One-time purchase, no subscription ever
- Free shipping
- Longest battery life ever
SUNNY applied — your Vacation SPF 50 mini ships in the box.
Batch 3 · Ships in December 2026–January 2027.
Cancel anytime before shipment for a full refund.
Secure checkout by Stripe
Charge it on the go.
So light you'll forget you're wearing it.
The thinnest, lightest tracker in the world, Ray looks good on your wrist and stays out of your day.
- Weight
- 7 grams
- Case
- Machined steel
- Finish
- Mirror-polished
- Water & dust
- IP68
- Charging port
- None
- Dark reserve
- 60 days
2-month battery life
Ray banks light. A full charge can power 60+ days of tracking even in total darkness — every heartbeat, every night of sleep, for two months straight.
Day 60 — still tracking.
Same tracking. No charger, no subscription.
| Spec | Ray | WHOOP 5.0 / MG | Apple Watch | Oura |
|---|---|---|---|---|
| Charging | Sunlight | 14+ days per charge | Daily | Every 4 to 7 days |
| Subscription | $0 | $199–$359/year | Optional | $6 / mo |
| Weight | 7 g | About 26.5 g (5.0) | ~38 g | ~5 g |
| Designed to last | 10+ years | Not specified | ~3 years | ~3 years |
| 5-year cost | $219 | $995–$1,795 | $800+ | $660 |
| Looks like | Jewelry | A fitness band | A computer | A ring |
WHOOP facts checked September 7, 2026: manufacturer specifications. Five years at current US annual list prices: One $199/year, Peak $239/year, Life $359/year. One and Peak include WHOOP 5.0; Life includes WHOOP MG. Promotions, taxes, future price changes and replacement hardware excluded. Other competitor figures are 2026 estimates. Apple Watch five-year cost assumes one mid-cycle replacement.
Batch 3 is now open
Our first two batches sold out. Order your Ray from Batch 3, shipping December 2026–January 2027. Made in America, with a hardware warranty and 60-day returns after delivery.
Customize your band
The Tech Specs.
Biosignals
- Body temperature trends
- Light & sun exposure
- Heart rate
- HRV
- Steps
- Activity
Battery
- 60 days in total darkness
- Runs forever on one minute of direct sun a day
- No charging port
Hardware
- 7 grams
- 11 mm polished steel case
- IP68 water and dust resistant
Durability
- Waterproof and dustproof to IP68
- Polished steel case that wears in naturally
- Under 2 g of non-recyclable parts per device
Built to last
- Designed to last 10+ years
- Fully encapsulated and sealed for life
- Hardware warranty
Connectivity
- iPhone and Android companion app
- Apple Health and Google Health Connect integration
- Low-power radio keeps EMF low and your phone battery high
In the box
- Ray, in the case and band you chose
- A lifetime of app updates
- Charger not included.
What the people are saying
You created a product that aligns with going outside. The most primitive activity of man.
Raghava U. Verified purchaser
“Your hardware passes the invisibility test. I forget it's on.”
Bryce H. Verified purchaser
Questions, answered.
Ray charges using outdoor sunlight only. About one minute of direct sunlight outdoors per day can sustain operation. A full charge provides about 60 days in total darkness, depending on settings and use. How solar charging works →
Indoor lighting barely charges Ray unless you’re right next to a window. It does charge outdoors in shade or cloud, and through the window on a car commute. A full charge lasts about 60 days in total darkness, so a little time outside every so often keeps it topped up. Best light for charging →
Yes. Ray is one of the lowest-EMF trackers you can wear. It charges from light as direct current, so there’s no wireless charging coil and no battery pack charging on your wrist. It uses very little power, its Bluetooth isn’t on all the time, and you can set it to stay off most of the day and sync only when you want your data. Ray does use Bluetooth Low Energy when it syncs, so it isn’t EMF-free. Our low-EMF guide →
Yes, fully waterproof and dustproof to IP68. Swim in it, shower in it, sleep in it. There is no charging port to fail. Water and band care →
Yes. Cancel any direct Ray order at any time before shipment for a full refund. After delivery, try Ray and return it within 60 calendar days for a full refund of the product price. Ordinary trial use is allowed and there is no restocking fee. Email team@getchargerless.com to start a cancellation or return. Customers normally pay return shipping; see our return terms for instructions and conditions. Return and refund details →
Batch 2 is sold out. New orders are for Batch 3, which ships in December 2026–January 2027. We’ll send updates as shipping approaches. Shipping and delivery →
No. $219 once, then it is yours. Lifetime app updates and a hardware warranty are included. How Ray’s cost compares →
Follow the build.
See the production updates, feature rollouts, and the occasional note from the workshop
No spam, no filler. Unsubscribe any time
Now that you've read the whole page,
your Ray could've charged twice.
Compared to other trackers, all the Ray is missing is the subscription and the dead battery.
A one-time cost for a decade of health insights.
Batch 3 · Ships in December 2026–January 2027
From the founder
“A few years ago I overheard someone on the train say they skipped their morning run because their Apple Watch was dead. That's when it clicked: these devices have gone too far. Ray is what a tracker should be: small, beautiful, self-powering, and yours forever.”
Andy Kong
Founder, Chargerless
MIT · ex-Google
